HOUSTON, April 8 (Reuters) – Exxon Mobil Corp (XOM.N) plans overhauls in the spring and at the end of this year at its 612,000 barrel-per-day Beaumont, Texas refinery, said people familiar with plant operations. In May, Exxon plans to shut the 60,000-bpd coker for a planned overhaul that will continue into June, the sources said. … Read more